Density of wood = mass/volume
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you weigh the block on a balance get its mass if it is a regular shape block so the volume should be length * weadth * breadth (side * side * side) the density = mass / volume
Density = Mass/VOlume = 120g/200cm3 = 0.6 grams per cm3
This density is 0,8 g/cm3.
The volume should be 200 cm3, not cm2. Density = Mass/Volume = 120g /200 cm3 = 0.6 g/cm3
To find the mass of a block of wood you should use a triple beam balance.